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authorJonas Danielsson <jonas@orbital-systems.com>2018-10-19 16:40:05 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2018-12-17 08:26:24 +0100
commitae460c115b7aa50c9a36cf78fced07b27962c9d0 (patch)
tree3d8f358df4de9f5f108577958469a313bad99a97 /drivers
parentmmc: dw_mmc-bluefield: simplify the probe() function (diff)
downloadlinux-ae460c115b7aa50c9a36cf78fced07b27962c9d0.tar.xz
linux-ae460c115b7aa50c9a36cf78fced07b27962c9d0.zip
mmc: atmel-mci: do not assume idle after atmci_request_end
On our AT91SAM9260 board we use the same sdio bus for wifi and for the sd card slot. This caused the atmel-mci to give the following splat on the serial console: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 538 at drivers/mmc/host/atmel-mci.c:859 atmci_send_command+0x24/0x44 Modules linked in: CPU: 0 PID: 538 Comm: mmcqd/0 Not tainted 4.14.76 #14 Hardware name: Atmel AT91SAM9 [<c000fccc>] (unwind_backtrace) from [<c000d3dc>] (show_stack+0x10/0x14) [<c000d3dc>] (show_stack) from [<c0017644>] (__warn+0xd8/0xf4) [<c0017644>] (__warn) from [<c0017704>] (warn_slowpath_null+0x1c/0x24) [<c0017704>] (warn_slowpath_null) from [<c033bb9c>] (atmci_send_command+0x24/0x44) [<c033bb9c>] (atmci_send_command) from [<c033e984>] (atmci_start_request+0x1f4/0x2dc) [<c033e984>] (atmci_start_request) from [<c033f3b4>] (atmci_request+0xf0/0x164) [<c033f3b4>] (atmci_request) from [<c0327108>] (mmc_start_request+0x280/0x2d0) [<c0327108>] (mmc_start_request) from [<c032800c>] (mmc_start_areq+0x230/0x330) [<c032800c>] (mmc_start_areq) from [<c03366f8>] (mmc_blk_issue_rw_rq+0xc4/0x310) [<c03366f8>] (mmc_blk_issue_rw_rq) from [<c03372c4>] (mmc_blk_issue_rq+0x118/0x5ac) [<c03372c4>] (mmc_blk_issue_rq) from [<c033781c>] (mmc_queue_thread+0xc4/0x118) [<c033781c>] (mmc_queue_thread) from [<c002daf8>] (kthread+0x100/0x118) [<c002daf8>] (kthread) from [<c000a580>] (ret_from_fork+0x14/0x34) ---[ end trace 594371ddfa284bd6 ]--- This is: WARN_ON(host->cmd); This was fixed on our board by letting atmci_request_end determine what state we are in. Instead of unconditionally setting it to STATE_IDLE on STATE_END_REQUEST. Signed-off-by: Jonas Danielsson <jonas@orbital-systems.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mmc/host/atmel-mci.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index be53044086c7..fbc56ee99682 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1954,13 +1954,14 @@ static void atmci_tasklet_func(unsigned long priv)
}
atmci_request_end(host, host->mrq);
- state = STATE_IDLE;
+ goto unlock; /* atmci_request_end() sets host->state */
break;
}
} while (state != prev_state);
host->state = state;
+unlock:
spin_unlock(&host->lock);
}